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