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