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