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