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