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