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)(20,22)(21,26)(23,25)(24,29)(27,31)(30,32) involution — undirected(1,2,6,7)(3,4,8,5)(9,10)(11,15)(12,16)(13,14)(17,19)(18,24)(20,30)(21,27)(22,26)(23,29)(25,28)(31,32)(1,3)(2,4)(5,7)(6,8)(9,11,13,12)(10,15,14,16)(18,25)(19,29)(20,27)(26,32)(1,4,6,5)(2,8,7,3)(9,11,13,12)(10,15,14,16)(17,20,23,27)(18,22,25,31)(19,30,29,21)(24,26,28,32)(1,5,6,4)(2,3,7,8)(9,12,13,11)(10,16,14,15)(17,21,23,30)(18,26,25,32)(19,20,29,27)(22,24,31,28)(17,22)(18,27)(19,26)(20,25)(21,24)(23,31)(28,30)(29,32) 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.