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