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