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