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