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