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