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)(20,25)(21,23)(22,26)(27,29)(28,30)(31,32) involution — undirected(2,5)(6,8)(9,11,12,15)(10,13,14,16)(18,23)(19,27)(20,29)(22,31)(24,30)(25,28)(10,14)(13,16)(17,19,21,25)(18,24,23,20)(22,28,31,27)(26,30,32,29)(1,3,4,7)(2,6,5,8)(18,23)(19,28)(20,30)(22,31)(24,29)(25,27)(17,20,21,24)(18,25,23,19)(22,29,31,30)(26,27,32,28)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.