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