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