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