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