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