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