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