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