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