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