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