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