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