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