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