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