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