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