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