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