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