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