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