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