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