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