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