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