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