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