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