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