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