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