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