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