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