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