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