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