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