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