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