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