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)(11,14)(12,21)(13,17)(15,18)(16,20)(19,24)(22,23)(25,26)(27,34)(28,32)(29,36)(30,33)(31,38)(35,39)(37,40)(1,3,4,7)(2,5,6,8)(9,11)(10,14)(12,13)(15,19)(16,22)(17,21)(18,24)(20,23)(25,27)(26,29)(28,35)(30,36)(31,39)(32,37)(33,34)(38,40)(1,2)(3,5)(4,6)(7,8)(11,19)(13,23)(14,24)(17,22)(25,28,30,38)(26,31,33,32)(27,35,36,40)(29,39,34,37)(9,12)(10,16)(11,13)(14,22)(15,20)(17,24)(18,21)(19,23)(25,26)(27,29)(28,31)(30,33)(32,38)(34,36)(35,39)(37,40) involution — undirected(1,3)(2,5)(4,7)(6,8)(9,13)(10,17)(11,20)(12,19)(14,16)(15,23)(18,22)(21,24)(25,28)(26,32)(27,35)(29,37)(30,38)(31,33)(34,39)(36,40) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,14)(10,11)(12,22)(13,16)(15,24)(17,20)(18,19)(21,23)(25,29)(26,27)(28,37)(30,34)(31,40)(32,35)(33,36)(38,39) 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.