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