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