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