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