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