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