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