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