One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,6)(3,7,8,5)(9,10,12,13)(11,14,15,16)(17,18,21,26)(19,28,20,24)(22,27,23,32)(25,29,30,31)(1,3,4,8)(2,5,6,7)(10,13)(11,15)(17,18)(19,25)(20,30)(21,26)(22,32)(23,27)(24,29)(28,31)(10,13)(14,16)(17,19,21,20)(18,24,26,28)(22,31,23,29)(25,27,30,32)(3,8)(5,7)(9,11,12,15)(10,14,13,16)(17,20,21,19)(18,25,26,30)(22,31,23,29)(24,27,28,32)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.