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