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