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