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