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