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