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