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