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