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