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