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