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