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