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