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