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