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