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