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