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