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