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