One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(17,18,23,21)(19,24,22,31)(20,27,30,32)(25,26,28,29)(1,3,7,4)(2,5,8,6)(9,10)(11,15)(12,14)(13,16)(17,19,23,22)(18,24,21,31)(20,26,30,29)(25,27,28,32)(1,4,7,3)(2,5,8,6)(9,11)(10,13)(12,16)(14,15)(17,20,22,29,23,30,19,26)(18,25,24,27,21,28,31,32)(1,5,7,6)(2,3,8,4)(11,16)(13,15)(17,21,23,18)(19,24,22,31)(20,28,30,25)(26,27,29,32)(1,6,7,5)(2,3,8,4)(10,14)(13,15)(17,19,23,22)(18,24,21,31)(20,26,30,29)(25,27,28,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.