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