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