Here is a detailed guide on how to make an Mac OS X El Capitan bootable USB flash drive using DiskMaker X, the easiest and most user-friendly method. Then Right-click on that flash you want to create bootable USB for Mac OS El Capitan then select Restore with Disk Image. Create a bootable USB drive for macOS X versions including El Capitan, Yosemite, Mavericks, Sierra, High Sierra, Mojave, Catalina and Big Sur.

This is Ultimate tutorial for installing Mac OSX up to EL Capitan 10.11.
You don't need working mac installation or AHCI capable motherboard, it can be done on any PC.
Tools that you need:
OSF Mount - http://www.osforensics.com/tools/mount-disk-images.html - This is most important tool, it can mount efi partition on image and edit it.
image link: https://goo.gl/nMcpOG
win 32 disk imager - http://win32-disk-imager.en.uptodown.com/ - this will be used to write image to USB, you can also use other software, there are many of them, i use this one.
In case you did not listen to me and you want to do this harder way:
http://www.hackintosh.zone/file/828-bootdiskutility-v212015/ - utility that can install clover from windows.
https://sourceforge.net/projects/cloverefiboot/files/Installer/ - Clover installer package
The most important note!!! ---- You need Sata kext in 10.11 folder, that will make your HDD to show up in disk manager, without it you will get still waiting for root device and your HDD wont show up in disk utility and you wont be able to install EL Capitan on your HDD.
My Specs :
Processor - e7200 core2duo
Ram - 6gb - different modules with different speed and latency
HDD - 320+720gb - sata2
USB - 16gb Kingstone
GPU - HD 7850 2gb dual bios.
Motherboard - P5N-D - https://www.asus.com/Motherboards/P5ND/

DiskMaker X (formerly Lion DiskMaker) is an application built with AppleScript that you can use with many versions of OS X to build a bootable drive from OS X installer program (the one you download from the App Store). As soon as you launch the application, it tries to find the OS X Install program with Spotlight. Then, it proposes to build a bootable install disk and make it look as nice as possible. It’s the easiest way to build an OS X Installer in a few clicks ! Then you can use the Install drive to fully re-install the OS on a freshly formated drive, or install it on your many Macs without re-downloading the full installer.

Jump over the break to learn how to use DiskMaker X…

1. Get an an empty flash drive with at least 8GB of storage

2. Download OS X El Capitan

3. Download DiskMaker X

El Capitan Bootable Usb Download

4. Double-click on the .dmg file to open it and drag-and-drop the DiskMaker X app into the Applications folder

5. Now load DIskMaker X. When you load the app, it will ask you which version of OS X do you want to make a boot disk of. You can choose Mavericks, Yosemite and of course, El Capitan. We’ll choose El Capitan

6. Now, the app will search for a copy of OS X El Capitan. Once it found your El Capitan copy, it will ask you if you want to use the copy that it found or you want to use another copy. If you downloaded it from the app store ( step 2 ), choose ‘Use this copy’

7. Now the app will ask you about your thumb drive, and it will tell you that will be completely erased before copying OS X El Capitan onto it…

8. Now the app will format your flash drive and ask you for your admin password. Once you enter your admin password, DiskMaker X will start copying the necessary El Capitan files onto your flash drive.

Bootable El Capitan Usb

NOTE: this process will take a while. Be patient….

Making Bootable El Capitan Usb

9. When you’re done, the app will tell you that the boot disk is ready, you’ll see that your flash drive has been renamed as OS X 10.11 Install Disk and it will be opened. Now all you have to do is restart your Mac and and after you here the chime sound, press the Option ( Alt ) key until you see the option to choose the flash drive to boot from.