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