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