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)(25,26,31,36)(27,34,38,32)(28,39,35,30)(29,37,40,33)(1,2)(3,6)(4,7)(5,8)(12,19)(15,17)(20,24)(22,23)(25,27,31,38)(26,32,36,34)(28,29,35,40)(30,37,39,33)(1,3)(2,5)(4,8)(6,7)(10,11)(15,17)(16,18)(22,23)(25,28,31,35)(26,30,36,39)(27,29,38,40)(32,37,34,33)(1,2)(3,5)(4,7)(6,8)(9,11,14,10)(12,17,19,15)(13,18,21,16)(20,23,24,22)(25,29,31,40)(26,33,36,37)(27,35,38,28)(30,34,39,32)(1,3)(2,6)(4,8)(5,7)(9,12)(10,15)(11,17)(13,20)(14,19)(16,22)(18,23)(21,24)(25,27)(26,34)(28,29)(30,33)(31,38)(32,36)(35,40)(37,39) involution — undirected(1,2)(3,5)(4,7)(6,8)(9,13,14,21)(10,16,11,18)(12,20,19,24)(15,22,17,23)(25,30)(26,35)(27,37)(28,36)(29,34)(31,39)(32,40)(33,38)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.