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