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