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