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