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