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