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