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