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