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