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