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