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