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