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