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