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