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