On this page you'll find the latest versions of my software for calculating atomic positions and displaying them along with magnetic structure using POVray. It was intended as part of my dipole field program, but works quite well on its own. Here's the sort of thing you can produce:
By specifying the space group and an atomic position sga.pl will create a file of all atomic positions. You can then use this to create a POVray scene using povmaker.pl. If you have a magnetic structure you can display that too.
The source code may be downloaded here: