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