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)(17,18,22,26)(19,29,30,24)(20,25,21,27)(23,28,31,32)(9,10)(11,15)(12,16)(13,14)(17,19)(18,24)(20,31)(21,23)(22,30)(25,28)(26,29)(27,32) involution — undirected(2,5)(6,8)(9,11,13,12)(10,15,14,16)(17,20,31,19,22,21,23,30)(18,25,32,29,26,27,28,24)(1,3,4,7)(2,6,5,8)(9,12,13,11)(10,16,14,15)(18,26)(24,29)(25,27)(28,32)(10,14)(15,16)(17,21,23,19,22,20,31,30)(18,27,28,29,26,25,32,24)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.