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