graduates and visiting graduates

I am aware that the uni has both graduates and visiting graduates;

?what, if anything is the difference?

Those with the title of Graduate have been through our training program. Visiting Graduates are those who have completed training elsewhere and have shown they comply with our standards.

A graduate is someone who qualified from this University (site).

A visiting graduate is someone who qualified at one of the other training sites (Tom Coyote, SWI, etc.), and is recognised as being equivalent ability to a graduate here.

the title 'visiting ' kind of suggests they are only here temporarily...as in a visitor and not a permanent resident member

They aren't temporarily but they're trained at another university.