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