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