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