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