The Codices for Daemon Hunters and Witch Hunters are available for free on the GW website. Of those, Witch Hunters offers quite a bit of detail on the Sisters' faith-based powers, their wargear, their decorations and emblems, etc. You just need to do a free registration to access it.
is the link to Codex: Witch Hunters.
is the link to Codex: Daemon Hunters.