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