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