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