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