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