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