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