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