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