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