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