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