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