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