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