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