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