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