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