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