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