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