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