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