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