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