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