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