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