[PyMOL] How do I color and label unit cell

Hello,
I would like to display crystal packing of my molecule with unit cell
labeled and colored in black.  I was able to show the unit cell by using
the command, (show cell, hex).  But I could not figure out how to change the
color of the unit cell, the default color is orange.  I also want to label
the x, y, z axes and the origin.

Many thanks,

Lan Xu