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