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