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