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