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)(13,14,19,22)(15,23,25,28)(16,24,27,20)(17,21,18,26)(5,7,11,9)(6,12,10,8)(13,15,17,24,19,25,18,20)(14,16,26,28,22,27,21,23)(1,2,3,4)(5,8,11,12)(6,7,10,9)(13,16,19,27)(14,20,22,24)(15,21,25,26)(17,28,18,23)(5,9,11,7)(6,12,10,8)(13,17,19,18)(14,21,22,26)(15,24,25,20)(16,23,27,28)(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.