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