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