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