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