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