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