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