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