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