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