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