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