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)(15,16)(17,18)(19,20)(21,22,25,24)(23,26,27,28)(6,9)(10,11)(13,15,18,20)(14,19,17,16)(23,27)(26,28)(13,16,18,19)(14,20,17,15)(21,23)(22,26)(24,28)(25,27)(1,3,4,2)(5,7)(6,10)(8,12)(9,11)(13,17,18,14)(15,19,20,16)(5,6)(7,10)(8,9)(11,12)(13,15)(14,16)(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.