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