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