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