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