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