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