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