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