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