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)(25,26,30,33)(27,31,34,38)(28,32,37,29)(35,39,40,36)(3,4)(7,8)(9,10,14,15)(11,12,16,19)(13,17,21,22)(18,20,23,24)(25,27)(26,31)(28,35)(29,36)(30,34)(32,39)(33,38)(37,40)(1,3)(2,7)(4,6)(5,8)(11,16)(12,19)(13,21)(17,22)(27,34)(28,37)(29,32)(31,38) involution — undirected(3,4)(7,8)(9,11)(10,12)(13,18)(14,16)(15,19)(17,20)(21,23)(22,24)(25,28,30,37)(26,32,33,29)(27,35,34,40)(31,39,38,36)(1,4,6,3)(2,7,5,8)(9,12)(10,16)(11,15)(13,20)(14,19)(17,23)(18,22)(21,24)(25,29,30,32)(26,28,33,37)(27,36,34,39)(31,35,38,40)(1,5,6,2)(3,7,4,8)(9,13)(10,17)(11,18)(12,20)(14,21)(15,22)(16,23)(19,24)(25,27)(26,31)(28,35)(29,36)(30,34)(32,39)(33,38)(37,40)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.