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