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