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