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