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