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