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