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