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