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