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