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