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