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