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