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