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