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