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