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