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