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