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