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