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