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