Can MeshMixer export models for color 3D printing?
Color is only displayed if you set MeshMixer to render VertexColor:

MM menue/View/MeshColorMode/VertexColor


Color should be visible if VertexColor is active.


Meshmixer is a sculpting program, so it isn’t made for taking exact
measurements, creating mechanical parts, or creating architecture
models.
Basic rendering options make pretty screenshots, but advanced users
might want to add in backgrounds or set up custom lighting.


Also, you can read more about this matter on this link.