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