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