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