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