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