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