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