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