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