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