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