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