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