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