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