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)(13,17,24,22)(14,23,20,18)(26,29)(27,33)(32,37)(35,36)(1,2)(3,7)(4,8)(5,6)(9,11)(10,16)(12,19)(13,14)(15,21)(17,18)(20,24)(22,23)(25,26,30,29)(27,34,33,31)(28,32,38,37)(35,40,36,39)(1,3,5,4)(2,7,6,8)(9,10,15,12)(11,19,21,16)(13,22,24,17)(14,18,20,23)(25,27,30,33)(26,31,29,34)(28,36,38,35)(32,40,37,39)(1,4,5,3)(2,8,6,7)(9,12,15,10)(11,19,21,16)(13,22,24,17)(14,23,20,18)(25,28,30,38)(26,32,29,37)(27,35,33,36)(31,39,34,40)(9,13)(10,17)(11,20)(12,22)(14,21)(15,24)(16,23)(18,19)(25,27)(26,31)(28,35)(29,34)(30,33)(32,39)(36,38)(37,40) involution — undirected(9,14,15,20)(10,18,12,23)(11,13,21,24)(16,17,19,22)(25,29,30,26)(27,34,33,31)(28,37,38,32)(35,40,36,39)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.