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