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