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