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