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