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