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