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