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