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