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