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