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