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