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