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