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