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