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