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