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