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