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