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