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