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