You can only print one color at a time. However, you can split your model in multiple pieces and print them separately in different colors, or you can just paint it.

You can try any UV-curable resin but at your own risk. Since Peachy Printer is not released yet, nobody experimented with third-party resins as far as I know. You may want to read other topics in the forum with word "resin" in the subject if you want to know more.