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