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)(11,12,19,17)(13,16,22,23)(18,20,21,24)(2,6)(3,7)(9,10,14,15)(11,17,19,12)(13,16,22,23)(18,24,21,20)(25,26)(27,34)(28,31)(29,32)(30,33)(35,39)(36,37)(38,40)(1,3)(2,4)(5,7)(6,8)(10,15)(12,17)(16,23)(20,24)(25,27,30,32)(26,29,33,34)(28,36,38,35)(31,39,40,37)(1,4)(2,3)(5,8)(6,7)(9,11)(10,12)(13,21)(14,19)(15,17)(16,24)(18,22)(20,23)(25,26)(27,29)(28,31)(30,33)(32,34)(35,37)(36,39)(38,40) involution — undirected(9,12)(10,11)(13,20)(14,17)(15,19)(16,18)(21,23)(22,24)(25,28,30,38)(26,31,33,40)(27,35,32,36)(29,37,34,39)(9,13)(10,16)(11,18)(12,20)(14,22)(15,23)(17,24)(19,21)(25,29)(26,32)(27,33)(28,37)(30,34)(31,36)(35,40)(38,39) 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.