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