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