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