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