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