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