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