As I'm waiting for my joystick replacement part, I reverse engineered the buttons of the PS4 controller to be able to customize the colors.
Print your buttons in your desired color
Open the PS4 Controller
Replace the buttons
Close the controller
The printing should be done with the "finger-touching" surface to the top. You will have to turn the parts 180° as i designed it upside down. (I first printed it this way because i don't like to use supports)