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