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