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