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