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