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