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