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