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