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