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