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