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