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