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