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