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