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