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