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