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