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