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