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