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