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