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)(25,26,31,36)(27,37,38,32)(28,34,29,33)(30,35,40,39)(1,2,4,6)(3,5,7,8)(9,10,13,14)(11,17,19,15)(12,16,21,22)(18,24,20,23)(25,27,31,38)(26,32,36,37)(28,35,29,39)(30,33,40,34)(1,3)(2,5)(4,7)(6,8)(10,14)(15,17)(16,22)(23,24)(25,28,31,29)(26,33,36,34)(27,35,38,39)(30,32,40,37)(1,2)(3,5)(4,6)(7,8)(9,11)(10,15)(12,20)(13,19)(14,17)(16,24)(18,21)(22,23)(25,29,31,28)(26,34,36,33)(27,35,38,39)(30,32,40,37)(1,3)(2,5)(4,7)(6,8)(9,10)(11,15)(12,16)(13,14)(17,19)(18,23)(20,24)(21,22)(25,27)(26,32)(28,39)(29,35)(30,33)(31,38)(34,40)(36,37) involution — undirected(9,12,13,21)(10,16,14,22)(11,18,19,20)(15,23,17,24)(25,30,31,40)(26,35,36,39)(27,33,38,34)(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.