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