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