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