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