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)(11,13)(12,14)(15,16)(17,18)(19,24)(20,22)(21,25)(23,26)(27,28)(29,30)(31,32) involution — undirected(2,5)(6,8)(9,11,12,15)(10,13,14,16)(17,19,22,29)(18,24,20,30)(21,28,23,31)(25,27,26,32)(10,14)(13,16)(17,20,22,18)(19,27,29,32)(21,25,23,26)(24,31,30,28)(17,21)(18,25)(20,26)(22,23)(27,32)(28,31) involution — undirected(1,3,4,7)(2,6,5,8)(17,21,22,23)(18,26,20,25)(19,28,29,31)(24,32,30,27)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.