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