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