One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(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(2,5)(3,7)(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)(2,5)(6,8)(18,23)(19,28)(20,27)(26,32) involution — undirected(1,3,4,7)(2,6,5,8)(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.