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