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