One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6)(7,11)(8,9)(10,12)(13,14)(15,23)(16,28)(17,21)(18,31)(19,26)(20,30)(22,24)(25,40)(27,35)(29,39)(32,38)(33,37)(34,43)(36,42)(41,44)(6,9)(10,11)(13,15,24,27,17,26,18,32)(14,19,22,38,21,23,31,35)(16,25,33,42,29,41,30,43)(20,36,28,44,37,34,39,40)(2,4)(13,16,17,29)(14,20,21,37)(15,25,26,41)(18,33,24,30)(19,34,23,36)(22,39,31,28)(27,43,32,42)(35,40,38,44)(5,7,8,12)(6,10,9,11)(14,21)(19,23)(20,37)(22,31)(28,39)(34,36)(35,38)(40,44)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.