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