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