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