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)(15,18)(16,17)(19,20)(21,22,25,23)(24,27,28,26)(6,10)(8,11)(13,15,19,17)(14,16,20,18)(21,23,25,22)(24,26,28,27)(5,7,9,12)(6,8,10,11)(13,16,19,18)(14,15,20,17)(21,24,25,28)(22,26,23,27)(1,2,3,4)(5,7)(6,11)(8,10)(9,12)(13,17,19,15)(14,16,20,18)(5,8,9,11)(6,7,10,12)(13,18,19,16)(14,15,20,17)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.