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