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