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