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