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