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