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