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