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