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