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