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