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