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