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