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