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