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