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