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