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