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