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