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