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