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