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