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