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