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)(20,27)(23,28)(24,29)(26,31)(30,32) involution — undirected(1,3,7,4)(2,5,8,6)(9,10)(11,15)(12,14)(13,16)(19,25)(23,30)(26,31)(28,32)(1,4,7,3)(2,5,8,6)(9,11)(10,13)(12,16)(14,15)(17,18,20,22,21,24,27,29)(19,23,26,28,25,30,31,32)(1,5,7,6)(2,3,8,4)(11,16)(13,15)(17,19,21,25)(18,23,24,30)(20,26,27,31)(22,28,29,32)(1,6,7,5)(2,3,8,4)(10,14)(13,15)(19,25)(23,30)(26,31)(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.