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