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