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