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