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