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