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