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