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