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