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