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