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