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)(11,16)(12,15)(13,14)(17,18)(19,23)(20,22)(21,24)(25,26)(27,32)(28,30)(29,31) involution — undirected(4,8)(6,7)(10,13)(15,16)(17,18)(19,23)(20,22)(21,24)(25,26,29,31)(27,32,28,30)(2,3)(6,7)(9,11,14,12)(10,15,13,16)(17,18,20,22)(19,21,24,23)(25,27,29,28)(26,30,31,32)(1,3,5,2)(4,7,8,6)(9,12,14,11)(10,15,13,16)(17,18)(19,21)(20,22)(23,24)(25,28,29,27)(26,30,31,32)(1,4,5,8)(2,6,3,7)(9,13,14,10)(11,16,12,15)(17,19)(18,21)(20,24)(22,23)(25,26)(27,30)(28,32)(29,31)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.