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