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