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