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