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