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