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