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