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