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