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