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