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