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