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