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