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