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