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