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