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