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