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