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