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