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