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