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