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