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