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