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