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