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