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