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