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