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