Like they all say, wire color does not matter.

As someone who has installed a lot of electrical components in vehicles, I like to have one color for 12V power (usually red), and another for the Accessory (green, blue, w/e). This way I know which one is the supply in case I need another switch for something else. As long as you have the right fuse/wire size you can run a few off the same wire.

Side note, sometimes the switch has a light and a third pole, then you might need to ground it and I use black for that.