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