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