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