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