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