One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(6,10)(11,12)(13,14,18,23,20,15,19,26)(16,21,25,17,28,24,22,27)(1,3,4,2)(5,6)(7,11)(8,12)(9,10)(13,15)(14,20)(16,27)(17,28)(18,23)(19,26)(21,22)(24,25)(2,3)(5,7,9,8)(6,11,10,12)(13,16,18,25,20,28,19,22)(14,21,23,17,15,24,26,27)(5,8,9,7)(6,11,10,12)(13,17,18,24,20,27,19,21)(14,22,23,16,15,25,26,28)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.