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