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