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