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