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