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