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