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