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