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