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)(16,24,26,21)(17,20,27,23)(18,25,28,22)(2,4)(6,10)(11,12)(13,15,19,14)(16,21,26,24)(17,23,27,20)(18,22,28,25)(5,7,9,8)(6,11,10,12)(13,16,18,17,19,26,28,27)(14,20,22,24,15,23,25,21)(1,2,3,4)(13,17,18,26,19,27,28,16)(14,21,22,20,15,24,25,23)(5,8,9,7)(6,11,10,12)(16,26)(17,27)(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.