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)(13,14,19,23,20,17,18,22)(15,16,26,28,21,24,25,27)(1,2)(3,4)(5,7,8,11)(6,9,10,12)(13,15,18,25,20,21,19,26)(14,16,22,27,17,24,23,28)(1,2,4,3)(6,10)(9,12)(13,16)(14,21)(15,17)(18,28)(19,27)(20,24)(22,25)(23,26)(1,3,4,2)(13,17,20,14)(15,24,21,16)(18,23,19,22)(25,28,26,27)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.