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