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