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