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