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