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