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