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