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