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