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)(13,14,20,19)(15,17,22,28)(16,21,18,23)(24,27,25,26)(6,9)(10,12)(13,15,20,22)(14,17,19,28)(16,26,18,27)(21,24,23,25)(1,2,3,4)(13,16,20,18)(14,21,19,23)(15,24,22,25)(17,27,28,26)(5,7,8,11)(6,10,9,12)(13,17,20,28)(14,22,19,15)(16,24,18,25)(21,27,23,26)(13,18,20,16)(14,23,19,21)(15,25,22,24)(17,26,28,27)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.