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