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