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