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