We can print any colour space but we're recommend using the colour space that you shot your images in.
So whatever you have your camera set up in e.g. Adobe RGB, then ideally you would edit your files in Adobe RGB and we can print them in that colour space.
But, the long and short of it is either sRGB or Adobe RGB is fine.
(sRGB above)
(Adobe RGB Colour Space has a larger colour gamut than sRGB see above)