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