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