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