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