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