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