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