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