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