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