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