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