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