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