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)(13,14,18,16)(15,20,17,19)(22,25)(23,27)(5,7,9,12)(6,10,11,8)(14,16)(19,20)(21,22,26,25)(23,28,27,24)(5,7)(6,8)(9,12)(10,11)(13,15,18,17)(14,19,16,20)(21,23)(22,24)(25,28)(26,27)(1,3,4,2)(5,7)(6,8)(9,12)(10,11)(13,16,18,14)(15,20,17,19)(21,24,26,28)(22,27,25,23)(5,8)(6,7)(9,10)(11,12)(13,17,18,15)(14,20,16,19)(21,25,26,22)(23,28,27,24)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.