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