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