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