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