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)(27,35,36,32)(28,33,39,38)(29,37,40,34)(1,2,5,4)(3,7,8,6)(12,19)(15,17)(20,24)(22,23)(26,31)(28,39)(32,35)(34,37)(1,3,5,8)(2,6,4,7)(10,11)(15,17)(16,18)(22,23)(26,31)(27,36)(28,39)(29,40)(1,3,5,8)(2,7,4,6)(9,11,14,10)(12,17,19,15)(13,18,21,16)(20,23,24,22)(25,27)(26,32)(28,34)(29,38)(30,36)(31,35)(33,40)(37,39)(1,3)(2,7)(4,6)(5,8)(9,12)(10,15)(11,17)(13,20)(14,19)(16,22)(18,23)(21,24)(25,28)(26,33)(27,37)(29,32)(30,39)(31,38)(34,36)(35,40) 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)(25,29)(26,34)(27,38)(28,32)(30,40)(31,37)(33,36)(35,39)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.