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