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