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