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