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