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