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