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