Hello,
Please navigate to Dashboard -> Products -> Attributes -> Color -> Configure iterms and set the color, enable swatch as shown http://prntscr.com/jskm29
Navigate to Theme Settings > Shop > Attribute swatches > choose pa_color (your color attribute) and enable “Use images from product variations” if you want images instead of colors
Make sure each variation in a variable product has an image: http://prntscr.com/kk870w
You will find more instructions in this tutorial https://www.youtube.com/watch?v=TITlJ6Zg0so
If you still have the problem, contact us with admin access.
Best Regards