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