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