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