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