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