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