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