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