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