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