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