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