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