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