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