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