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