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