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