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