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