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