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