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