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