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