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