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