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)(24,41)(25,35)(26,36)(28,44)(29,40)(31,37)(32,39)(34,43)(38,42)(2,4)(5,6)(7,10)(8,9)(11,12)(13,15)(14,20)(16,28)(17,31)(18,26)(19,25)(21,38)(22,37)(23,35)(24,29)(27,44)(30,42)(32,43)(33,36)(34,39)(40,41) involution — undirected(6,9)(7,11)(13,16,18,30,19,29,17,32)(14,21,22,27,23,39,33,40)(15,24,26,43,25,28,31,42)(20,34,37,41,35,38,36,44)(5,7,8,11)(6,10,9,12)(15,25)(16,29)(20,35)(21,39)(26,31)(27,40)(30,32)(36,37)(6,9)(10,12)(13,17,19,18)(14,22,23,33)(15,26,25,31)(16,30,29,32)(20,36,35,37)(21,40,39,27)(24,42,28,43)(34,41,38,44)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.