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