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