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