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