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