I can't really help with specific paint names, but, basically, I'd suggest mixing some pink and white to get quite a light, pale pink, pick one or two main parts on each cultist, paint them that colour...then purple, pick a random part on each cultist and paint it purple...then maybe paint the boots and belts/straps black?...that should get you a fitting basic colour scheme...I leave highlighting, weathering, and small details to your discretion though, as they're more of a "personal taste" thing.
basically, lots of pale pink, some purple, and a little bit of black...and try to mix it up as much as possible between cultists - the less uniformity the better