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