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