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