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