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