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