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