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