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