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