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