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