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