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