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