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