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