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)(19,26)(20,31)(21,25)(22,24)(23,30)(27,28)(29,32) involution — undirected(1,2)(3,6)(4,5)(7,8)(17,19,21,30)(18,23,25,26)(20,28,22,29)(24,27,31,32)(9,11,13,12)(10,14,15,16)(17,18)(19,27)(20,24)(21,25)(22,31)(23,29)(26,28)(30,32)(1,3,4,7)(2,6,5,8)(17,20,21,22)(18,24,25,31)(19,28,30,29)(23,27,26,32)(2,5)(6,8)(9,12,13,11)(10,14,15,16)(19,29)(20,22)(23,27)(24,31)(26,32)(28,30)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.