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