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