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