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