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